CVE-2025-30269
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Use of Externally-Controlled Format String in Qsync Central Allows Data Exposure

Publication date: 2026-02-11

Last updated on: 2026-02-11

Assigner: QNAP Systems, Inc.

Description
A use of externally-controlled format string vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to obtain secret data or modify memory. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

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Meta Information

Published
2026-02-11
Last Modified
2026-02-11
Generated
2026-07-06
AI Q&A
2026-02-11
EPSS Evaluated
2026-07-05
NVD
CVE-2025-30269
EUVD
EUVD-2025-207456

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
qnap qsync_central From 5.0.0.0 (inc) to 5.0.0.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-134 The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

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Impact Analysis

If exploited, this vulnerability can allow an attacker to access secret data or alter memory, potentially leading to unauthorized information disclosure or system instability.

Compliance Impact

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Detection Guidance

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Executive Summary

This vulnerability is a use of externally-controlled format string issue affecting Qsync Central. It allows a remote attacker who has gained a user account to exploit the vulnerability to obtain secret data or modify memory.

Mitigation Strategies

To mitigate this vulnerability, you should update Qsync Central to version 5.0.0.4 or later, as the vulnerability has been fixed in that release.

Additionally, restrict remote attacker access by limiting user account permissions and monitoring for suspicious activity.

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